FCC Part73

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Federal Communications Commission § 73.213

Stationclass

Maximum ERPReferenceHAAT in

meters (ft.)

Classcontourdistancein kilo-meters

A ... .. .. . 6kW (7.8 dBk) . .. .. .. .. .. .. .. 240 (787) 42

B1 ... .. . 25kW (14.0 dBk) . .. .. .. .. .. 150 (492) 46

B ........ 50kW (17.0 dBk) ........... 472 (1549) 78

(c) Existing stations. Stations author-

ized prior to March 1, 1984 that do not

conform to the requirements of this

section may continue to operate as au-

thorized. Stations operating with fa-

cilities in excess of those specified in

paragraph (b) of this section may not

increase their effective radiated powers

or extend their 1 mV/m field strength

contour beyond the location permitted

by their present authorizations. The

provisions of this section will not apply

to applications to increase facilities for

those stations operating with less than

the minimum power specified in para-

graph (a) of this section.

(d) Existing Class C stations below min-

imum antenna HAAT. Class C stations

authorized prior to January 19, 2001

that do not meet the minimum an-

tenna HAAT specified in paragraph

(a)(2) of this section for Class C sta-

tions may continue to operate as au-thorized subject to the reclassification

procedures set forth in Note 4 to

§ 73.3573.

[53 FR 17042, May 13, 1988, as amended at 54

FR 16367, Apr. 24, 1989; 54 FR 19374, May 5,

1989; 54 FR 35339, Aug. 25, 1989; 65 FR 79777,

Dec. 20, 2000]

§ 73.212 Administrative changes in au-thorizations.

(a) In the issuance of FM broadcast

station authorizations, the Commis-

sion will specify the transmitter out-

put power and effective radiated power

in accordance with the following tab-

ulation:

Power (watts or kW)

Roundedout to

nearest fig-ure (watts

or kW)

1 to 3 ................................................................... .05

3 to 10 ................................................................. .1

10 to 30 ............................................................... .5

30 to 100 ............................................................. 1

100 to 300 ........................................................... 5

300 to 1,000 ........................................................ 10

(b) Antenna heights above average

terrain will be rounded out to the near-

est meter.

[28 FR 13623, Dec. 14, 1963, as amended at 48

FR 29506, June 27, 1983]

§ 73.213 Grandfathered short-spacedstations.

(a) Stations at locations authorized

prior to November 16, 1964, that did not

meet the separation distances required

by § 73.207 and have remained continu-

ously short-spaced since that time may

be modified or relocated with respect

to such short-spaced stations, provided

that (i) any area predicted to receive

interference lies completely within any

area currently predicted to receive co-

channel or first-adjacent channel inter-

ference as calculated in accordance

with paragraph (a)(1) of this section, or

that (ii) a showing is provided pursuant

to paragraph (a)(2) of this section that

demonstrates that the public interest

would be served by the proposed

changes.

(1) The F(50,50) curves in Figure 1 of

§ 73.333 are to be used in conjunction

with the proposed effective radiated

power and antenna height above aver-

age terrain, as calculated pursuant to

§ 73.313(c), (d)(2) and (d)(3), using datafor as many radials as necessary, to de-

termine the location of the desired

(service) field strength. The F(50,10)

curves in Figure 1a of § 73.333 are to be

used in conjunction with the proposed

effective radiated power and antenna

height above average terrain, as cal-

culated pursuant to § 73.313(c), (d)(2)

and (d)(3), using data for as many

radials as necessary, to determine the

location of the undesired (interfering)

field strength. Predicted interference is

defined to exist only for locations

where the desired (service) field

strength exceeds 0.5 mV/m (54 dBu) for

a Class B station, 0.7 mV/m (57 dBu) for

a Class B1 station, and 1 mV/m (60 dBu)for any other class of station.

(i) Co-channel interference is pre-

dicted to exist, for the purpose of this

section, at all locations where the

undesired (interfering station) F(50,10)

field strength exceeds a value 20 dB

below the desired (service) F(50,50) field

strength of the station being consid-

ered (e.g., where the protected field

strength is 60 dBu, the interfering field

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47 CFR Ch. I (10–1–09 Edition)§ 73.213

strength must be 40 dBu or more for

predicted interference to exist).

(ii) First-adjacent channel inter-

ference is predicted to exist, for the

purpose of this section, at all locations

where the undesired (interfering sta-

tion) F(50,10) field strength exceeds a

value 6 dB below the desired (service)

F(50,50) field strength of the station

being considered (e.g., where the pro-

tected field strength is 60 dBu, the

interfering field strength must be 54

dBu or more for predicted interference

to exist).

(2) For co-channel and first-adjacent

channel stations, a showing that the

public interest would be served by the

changes proposed in an application

must include exhibits demonstrating

that the total area and population sub-

ject to co-channel or first-adjacent

channel interference, caused and re-

ceived, would be maintained or de-

creased. In addition, the showing must

include exhibits demonstrating that

the area and the population subject to

co-channel or first-adjacent channel in-

terference caused by the proposed facil-

ity to each short-spaced station indi-

vidually is not increased. In all cases,

the applicant must also show that anyarea predicted to lose service as a re-

sult of new co-channel or first-adja-

cent-channel interference has adequate

aural service remaining. For the pur-

pose of this section, adequate service is

defined as 5 or more aural services (AM

or FM).

(3) For co-channel and first-adjacent-

channel stations, a copy of any applica-

tion proposing interference caused in

any areas where interference is not

currently caused must be served upon

the licensee(s) of the affected short-

spaced station(s).

(4) For stations covered by this para-

graph (a), there are no distance separa-

tion or interference protection require-ments with respect to second-adjacent

and third-adjacent channel short-

spacings that have existed continu-

ously since November 16, 1964.

(b) Stations at locations authorized

prior to May 17, 1989, that did not meet

the IF separation distances required by

§73.207 and have remained short-spaced

since that time may be modified or re-

located provided that the overlap area

of the two stations’ 36 mV/m field

strength contours is not increased.

(c) Short spacings involving at least

one Class A allotment or authoriza-

tion. Stations that became short

spaced on or after November 16, 1964

(including stations that do not meet

the minimum distance separation re-

quirements of paragraph (c)(1) of this

section and that propose to maintain

or increase their existing distance sep-

arations) may be modified or relocated

in accordance with paragraph (c)(1) or

(c)(2) of this section, except that this

provision does not apply to stationsthat became short spaced by grant of

applications filed after October 1, 1989,

or filed pursuant to §73.215. If the ref-

erence coordinates of an allotment are

short spaced to an authorized facility

or another allotment (as a result of the

revision of §73.207 in the Second Report

and Order in MM Docket No. 88–375), an

application for the allotment may be

authorized, and subsequently modified

after grant, in accordance with para-

graph (c)(1) or (c)(2) of this section only

with respect to such short spacing. No

other stations will be authorized pursu-

ant to these paragraphs.

(1) Applications for authorization under

requirements equivalent to those of priorrules. Each application for authority to

operate a Class A station with no more

than 3000 watts ERP and 100 meters an-

tenna HAAT (or equivalent lower ERP

and higher antenna HAAT based on a

class contour distance of 24 km) must

specify a transmitter site that meets

the minimum distance separation re-

quirements in this paragraph. Each ap-

plication for authority to operate a

Class A station with more than 3000

watts ERP (up to a maximum of 5800

watts), but with an antenna HAAT

lower than 100 meters such that the

distance to the predicted 0.05 mV/m (34

dBμV/m) F(50,10) field strength contour

does not exceed 98 km must specify atransmitter site that meets the min-

imum distance separation require-

ments in this paragraph. Each applica-

tion for authority to operate an FM

station of any class other than Class A

must specify a transmitter site that

meets the minimum distance separa-

tion requirements in this paragraph

with respect to Class A stations oper-

ating pursuant to this paragraph or


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Federal Communications Commission § 73.215

paragraph (c)(2) of this section, and

that meets the minimum distance sep-

aration requirements of §73.207 with re-

spect to all other stations.

MINIMUM DISTANCE SEPARATION REQUIREMENTS IN KILOMETERS (MILES)

Relation Co-channel 200 kHz 400/600 kHz 10.6/10.8 MHz

A to A ............................................................ 105 (65) 64 (40) 27 (17) 8 (5)A to B1 .......................................................... 138 (86) 88 (55) 48 (30) 11 (6)A to B ............................................................ 163 (101) 105 (65) 69 (43) 14 (9)A to C3 .......................................................... 138 (86) 84 (52) 42 (26) 11 (6)A to C2 .......................................................... 163 (101) 105 (65) 55 (34) 14 (9)A to C1 .......................................................... 196 (122) 129 (80) 74 (46) 21 (13)A to C ............................................................ 222 (138) 161 (100) 94 (58) 28 (17)

(2) Applications for authorization of Class A facilities greater than 3,000

watts ERP and 100 meters HAAT. Each

application to operate a Class A sta-

tion with an ERP and HAAT such that

the reference distance would exceed 24

kilometers must contain an exhibit

demonstrating the consent of the li-

censee of each co-channel, first, second

or third adjacent channel station (for

which the requirements of § 73.207 are

not met) to a grant of that application.

Each such application must specify a

transmitter site that meets the appli-

cable IF-related channel distance sepa-

ration requirements of § 73.207. Applica-

tions that specify a new transmitter

site which is short-spaced to an FMstation other than another Class A sta-

tion which is seeking a mutual in-

crease in facilities may be granted only

if no alternative fully-spaced site or

less short-spaced site is available. Li-

censees of Class A stations seeking mu-

tual increases in facilities need not

show that a fully spaced site or less

short-spaced site is available. Applica-

tions submitted pursuant to the provi-

sions of this paragraph may be granted

only if such action is consistent with

the public interest.

[52 FR 37789, Oct. 9, 1987, as amended at 54 FR

14964, Apr. 14, 1989; 54 FR 35339, Aug. 25, 1989;

56 FR 27426, June 14, 1991; 62 FR 50521, Sept.

26, 1997; 63 FR 33876, June 22, 1998]

§ 73.215 Contour protection for short-spaced assignments.

The Commission will accept applica-

tions that specify short-spaced antenna

locations (locations that do not meet

the domestic co-channel and adjacent

channel minimum distance separation

requirements of § 73.207); Provided

That, such applications propose con-

tour protection, as defined in para-graph (a) of this section, with all short-

spaced assignments, applications and

allotments, and meet the other appli-

cable requirements of this section.

Each application to be processed pursu-

ant to this section must specifically re-

quest such processing on its face, and

must include the necessary exhibit to

demonstrate that the requisite contour

protection will be provided. Such appli-

cations may be granted when the Com-

mission determines that such action

would serve the public interest, con-

venience, and necessity.

(a) Contour protection. Contour pro-

tection, for the purpose of this section,

means that on the same channel and on

the first, second and third adjacent

channels, the predicted interfering con-

tours of the proposed station do not

overlap the predicted protected con-

tours of other short-spaced assign-

ments, applications and allotments,

and the predicted interfering contours

of other short-spaced assignments, ap-

plications and allotments do not over-

lap the predicted protected contour of

the proposed station.

(1) The protected contours, for the

purpose of this section, are defined as

follows. For all Class B and B1 stations

on Channels 221 through 300 inclusive,

the F(50,50) field strengths along theprotected contours are 0.5 mV/m (54

dBμ) and 0.7 mV/m (57 dBμ), respec-

tively. For all other stations, the

F(50,50) field strength along the pro-

tected contour is 1.0 mV/m (60 dBμ).

(2) The interfering contours, for the

purpose of this section, are defined as

follows. For co-channel stations, the

F(50,10) field strength along the inter-

fering contour is 20 dB lower than the


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